Composite Resins/chemistry ; Composite Resins/therapeutic use ; Crowns ; Dental Materials/chemistry ; Dental Materials/therapeutic use ; Dental Stress Analysis* ; Finite Element Analysis ; Glass/chemistry ; Gold/chemistry ; Humans ; Incisor/drug effects ; Incisor/pathology ; Ketones/chemistry* ; Ketones/therapeutic use ; Polyethylene Glycols/chemistry* ; Polyethylene Glycols/therapeutic use ; Polymers/chemistry* ; Polymers/therapeutic use ; Tooth Root/drug effects* ; Tooth Root/pathology
Abstract
The aim of this study was to evaluate the biomechanical behavior and long-term safety of high performance polymer PEKK as an intraradicular dental post-core material through comparative finite element analysis (FEA) with other conventional post-core materials. A 3D FEA model of a maxillary central incisor was constructed. A cyclic loading force of 50 N was applied at an angle of 45° to the longitudinal axis of the tooth at the palatal surface of the crown. For comparison with traditionally used post-core materials, three materials (gold, fiberglass, and PEKK) were simulated to determine their post-core properties. PEKK, with a lower elastic modulus than root dentin, showed comparably high failure resistance and a more favorable stress distribution than conventional post-core material. However, the PEKK post-core system showed a higher probability of debonding and crown failure under long-term cyclic loading than the metal or fiberglass post-core systems.